<template>
    <el-container class="home-container">
        <!-- 头部区域 -->
        <el-header>
            <div>
                <img src="../assets/heima.png">
                <span>电商后台管理系统</span>
            </div>
            <el-button @click="logout" type="info">退出</el-button>
        </el-header>
        <!-- 页面主体区域 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse ? '64px' : '200px' ">
                <div class="toggle-button" @click="toggloCollapse">
                    |||
                </div>
                <!-- 侧边栏菜单区域 -->
                <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF" :unique-opened="true"
                                        :collapse='isCollapse' :collapse-transition="false" :router="true" :default-active="activePath">
                    <!-- 一级菜单 -->
                    <el-submenu :index="String(item.id)" v-for="item in menulist" :key="item.id">
                        <!-- 一级菜单的模板区 -->
                        <template slot="title">
                        <!-- 图标 -->
                        <i :class="iconsObj[item.id]"></i>
                        <!-- 文本 -->
                        <span>{{item.authName}}</span>      
                        </template>

                        <!-- 二级菜单 -->
                        <el-menu-item @click="saveNavState(String('/' + subItem.path))" :index="String('/' + subItem.path)" v-for="subItem in item.children" :key="subItem.id">
                            <template slot="title">
                                <!-- 图标 -->
                                <i class="el-icon-menu"></i>
                                <!-- 文本 -->
                                <span>{{subItem.authName}}</span>      
                            </template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!-- 右侧主体内容 -->
            <el-main>
                <!-- 路由占位符 -->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
    name:'Home',
    /* created: 这个钩子在实例被创建之后被调用.
        一般可以在created函数中调用axios获取页面初始化所需的数据。
    */
    created(){
        this.GetMenuList();
        this.activePath = window.sessionStorage.getItem('activePath');
    },
    data(){
        return{
            //左侧菜单数据
            menulist:[],
            iconsObj:{
                '125':'iconfont el-icon-user-solid',
                '103':'iconfont el-icon-s-check',
                '101':'iconfont el-icon-s-shop',
                '102':'iconfont el-icon-s-order',
                '145':'iconfont el-icon-s-marketing',
            },
            /* 是否折叠 */
            isCollapse:false,
            //被激活的链接地址
            activePath:'',
        }
    },
    methods:{
        logout(){
            //清空token值
            window.sessionStorage.clear();
            //跳转到登录页
            this.$router.push('/login');
        },
        /* 获取所有的菜单 */
        async GetMenuList(){
           const {data: res} = await this.$http.get('menus');
           if (res.meta.status == 200) {
               //把响应过来的数据赋值个menulist
               this.menulist = res.data;
               console.log(res);
           }else{
               return this.$message.error(res.meta.msg);
           }
        },
        //点击按钮，切换菜单的折叠与展开
        toggloCollapse(){
            this.isCollapse = !this.isCollapse;
        },
        //保存连接的激活状态
        saveNavState(activePath){
            window.sessionStorage.setItem('activePath',activePath);
            this.activePath =activePath
        }
    }
}
</script>

<style scoped>
    .home-container{
        height: 100%;
    }
    .el-header{
        background-color: #373d41;
        display: flex;
        justify-content: space-between;
        padding-left: 0;
        align-items: center;
        color: #fff;
        font-size: 25px;
    }
    .el-header > div {
        display: flex;
        align-items: center;
    }
    .el-header > div > span{
        margin-left: 17px;
    } 
    .el-aside{
        background-color: #333744;
    }
    .el-aside > .el-menu{
        border-right: none;
    }
    .el-main{
        background-color: #eaedf1;
    }
    .iconfont{
        margin-right: 10px;
    }
    .toggle-button{
        background-color: #4a5064;
        font-size: 10px;
        line-height: 24px;
        color: #fff;
        text-align: center;
        letter-spacing: 0.5em;
        cursor: pointer;
    }
</style>
